基于PLC的央空调温度器控制系统设计.doc

摘 要 本温度控制器设计采用变频器、PLC、温度传感器等器件的有机结合，构成温差闭环自动控制系统，自动调节水泵的输出流量达到节能目的。该系统采用西门子的S7—200PLC作为主控制单元，利用传统 PID 控制算法，通过西门子 MM440 变频器控制水泵运转速度，保证系统根据实际负荷的情况调整流量，实现恒温控制，从而最大程度的解决能源浪费问题。 本设计通过采用基于 USS 协议的RS-485总线通讯的网络，通过西门子 TD200文本显示器实现人机界面的设计，使用 MCGS 工控组态软件，对系统进行理论分析。通过分析该设计，验证了该设计的可靠性，可以解决中央空调温度控制器的能源浪费问题。 关键词：中央空调温度控制器，PLC，PID，变频器 ABSTRACT This design is developed based on the combination of frequency converter, PLC, temperature sensor. It makes up a temperature difference closed-loop automatic control system and automatically adjust the output flow of pump to achieve energy saving. The system adopts the Siemens S7-200 PLC as the main control unit, using the traditional PID to control algorithm, using Siemens MM440 inverter to control of pump speed, to guarantee system adjust load flow according to actual situation. All of these will bring out constant temperature control, so as to solve the problem of energy waste to a great extent. This design use RS - 485 bus communication networks which is based on USS protocol and using the Siemens TD200 to realize the human-computer interface design, and using the software made from MCGS, to carries on the theoretical analysis to the system. Verified the reliability of the design, the design can solve the problem of central air conditioning energy waste through the analysis of the design. KEY WORDS: The central air conditioning, PLC, PID, frequency converter目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc359319745 摘 要 PAGEREF _Toc359319745 \h I HYPERLINK \l _Toc359319746 ABSTRACT PAGEREF _Toc359319746 \h II HYPERLINK \l _Toc359319747 第1章 绪论 PAGEREF _Toc359319747 \h 1 HYPERLINK \l _Toc359319748 1.1 中央空调温度控制器的发展 PAGEREF _Toc359319748 \h 1 HYPERLINK \l _Toc359319749 1.1.1 中央空调温度控制器现在状况 PAGEREF _Toc359319749 \h 1 HYPERLINK \l _Toc359319750 1.1.2 中央空调温度控制发展趋势 PAGEREF _Toc359319750 \h 1 HYPERLINK \l _Toc359319751 1.2 本设计的意义 PAGEREF _Toc359319751 \h 1 HYPERLINK \l _Toc359319752 1.2.1 设计的主要内容 PAGEREF _Toc359319752 \h 1 HYPERLINK